The cause of a three-car freight-train derailment last week at the North Washington Park industrial switching yard is still under investigation.

Responders arrived at the scene near E. 58th Avenue and York Street shortly after a call was received at 10:18 a.m. July 6, according to Sandy Danne, a North Washington Fire Protection District spokeswoman. She said one of the cars involved in the accident contained non-flammable diesel exhaust fuel, but was not leaking at the time of the accident and was deemed to be not hazardous.

Danne said no one was injured in the accident but was unable to confirm what types of rail cars were involved in the accident. An XcelL Energy power pole was slightly damaged in the accident.

Xcel Energy spokesman Mark Stutz said one of the rail cars involved in the accident fell on the pole and had to be removed before the damage could be assessed. He said the accident and removal of the power pole, which took about hour for Xcel Energy crews to complete, did not affect service to nearby businesses and homes. No specific plans are in place to replace the pole but Stutz said it will happen once any investigation is complete.

Warren Flatau, a spokesman for the Federal Railroad Administration, said the department has jurisdiction over Denver Rock Island Railroad but has no plans to investigate the accident unless concerns are expressed by the public and local officials. He said the accident does not meet minimum standards to trigger an investigation, which include at least $9,900 in damage to train tracks or rail equipment.

An unnamed representative from Denver Rock Island Railroad, which owns the rail cars involved in the accident, said in an email the company had no comment.